6.25Gbps, 1.8V PC Board Equalizer

Industry's Smallest Backplane Equalizer Measures Only 1.5mm x 1.5mm

Please check latest availability status for a specific part variant.


The MAX3785 6.25Gbps equalizer operates from a single 1.8V supply and compensates for transmission-medium losses encountered with FR-4 transmission lines. Optimized for low-voltage, high-density, DC-coupled interconnections between the line card and switch card, the MAX3785 enables a system upgrade path while maintaining a legacy rate of 2.5Gbps to 3.125Gbps. Roughly the size of two 0603 passive components, the MAX3785 easily provides placement and routing flexibility.

The MAX3785 is composed of an equalizer, limiting amplifier, and output driver. For data rates of 3.2Gbps and lower, the MAX3785 equalizes signals for spans up to 40in of FR-4 board material. For data rates up to 6.25Gbps, the MAX3785 compensates for 30in of FR-4 board material. The MAX3785 is coding independent, functioning equally well for 8b/10b or scrambled signals.

The MAX3785 features DC-coupled current-mode logic (CML) data inputs and outputs. It is packaged in a tiny 1.5mm x 1.5mm chip-scale package (UCSP™) and a 6-pin TDFN package.
MAX3785: Typical Application Circuit MAX3785: Typical Application Circuit Enlarge+

Key Features

  • Single 1.8V Supply
  • Very Low Power, 60mW
  • Spans 30in with FR-4 at 6.25Gbps
  • Operates from 1.0Gbps to 6.4Gbps
  • Coding Independent, 8b/10b or Scrambled
  • DC-Coupled CML Inputs and Outputs
  • Small 1.5mm x 1.5mm Footprint


  • Double IEEE 802.3ae XAUI
  • Double STM-16/OC-48
  • HSBI for ≤ 6.4Gbps

See parametric specs for Equalizers (Cable and Circuit Board) (9)

Part NumberApplicationsData Rate
Data Rate
Max. Reach @ Max. Data RateVSUPPLY
I/O TypeChannelsRx Eq. @ Max. Rate
Package/PinsOper. Temp.
Copper Cable Interconnect
Fibre Channel
Printed Circuit Board Interconnect
100064000.8m FR41.8CML115
UCSP (B)/9
-20 to +85
0 to +85

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3785UTTEVKIT: Evaluation Kit for the MAX3785UTT
Product Reliability Reports: MAX3785.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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